Mulberry brown spot is the main mulberry field disease in Longyang District. It is commonly known as rotten leaf disease and focal spot disease. It is a leaf disease caused by fungi. It mainly occurs in shoots in the upper middle leaves. In the early stage of disease, the lesions are small and small, the diseased leaves can still feed silkworms, the heavy mulberry leaves are damaged, and the lesions are numerous and large, often connected into pieces, so that diseased leaves wither, early fall off or whole leaf rot, seriously affecting the mulberry leaf Quality of production. At the onset of the disease, the front and back of the leaf appeared pale brown to dark brown dots. The water was immersed and the size of sesame seeds was scattered. With the disease spread: lesions are often limited by veins, irregular shape, dark brown edges, the middle light brown. At the later stage of disease, white or reddish silt masses are produced in the lesions, which are conidial lumps that are washed out by the rain and often show black dots, which are conidial discs. When the disease is severe, several lesions can be connected. The piece is perforated. The pathogens are semi-known fungi, subsporidia, cryptosporidium, arborescens, sclerotinia and genus Alternaria. Mulberry brown spot, in the rainy season or in the wet environment, the mulberry garden is susceptible to disease. In rainy weather, the lesions swell and perforate after absorbing water, and the center of the disease often cracks in the dry weather. Moso brown spot prevention and control methods: (1) At the beginning of autumn and winter, the leaves of the mulberry field are cleared and burned to reduce the pathogens. (2) Strengthen the management of mulberry fields: Each year combined with winter plowing to increase organic fertilizers, low-lying mulberry fields should pay attention to trenching drainage, implement reasonable dense planting, reduce crop interplanting, improve mulberry garden permeability, and enhance mulberry disease resistance. (3) Elimination of overwintering germs: After the end of the autumn silkworm or before the mulberry sprouts in the spring, sprinkle branches or trunks with Baume 4 to 5 degrees lime sulfur to eliminate the overwintering germs. (4) In severely diseased mulberry gardens, severely diseased leaves should be removed in time and piled up to compost to reduce the sources of disease in mulberry fields. (5) Chemical control: In the early stage of disease, use 25% propiconazole EC 2500-3000 times spray, or use 50% carbendazim WP 1000-1500 times (add 0.3% detergent as adhesive) , Or 70% thiophanate 1500 times liquid spray treatment, spray again every 10 to 15 days.
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